[EC-151] Hide Subscription/Billing information for Provider-managed organizations

[eliykat]

Type of change

• [ ] Bug fix
• [x] New feature development
• [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• [ ] Build/deploy pipeline (DevOps)
• [ ] Other

Objective

Add helper methods for https://github.com/bitwarden/web/pull/1614.

Code changes

Add the manageBilling permission, which prevents owners from managing billing if their organization is managed by a provider.

Testing requirements

Before you submit

• [x] I have checked for linting errors (npm run lint) (required)
• [ ] I have added unit tests where it makes sense to do so (encouraged but not required)
• [ ] This change requires a documentation update (notify the documentation team)
• [ ] This change has particular deployment requirements (notify the DevOps team)